Drill-sharpener.



J. DITSON.

DRILL SHARPENER.

APPLICATION FILED JUNI: 30. 19u.

l 932,019., Patented Apr. 29, 1919.

2 SHEETS-SHEET l.

J. DITSON.

DRILL SHARPENER. APPLICATION men'xunsao. 19u.

` SHEETSAHEET 2.

Patented Apr. 29, 1919.

entre er JESSE DITSON, OF LITTLETON, COLORADO, ASSIGNOR TO THE J. GEO. LEYNER ENGINEERING WORKS COMPANY, OF LITTLETON, COLORADO, A C025911OIRJATION 0F COLORADO.

DRILL-SHABEENER.

Specification of Letters Patent.

Patented Apr., 2%, 191W.

Application filed June 30, 1917. Serial No. 178,028.

To all .whom t may concern.'

Be it known that I, Jesse Dirson, a citizen of the United States, residing at Littleton, in the county of Arapahoe and State of Colorado, have invented a certain new and useful Improvement in Drill-Sharpeners, of which the following is a specifica-tion.

This invention relates to drill Sharpeners, and in particular to rocl drill Sharpeners operated entirely by means of fluid pressure.

The objects of the present invention are to simplify and improve the construction and operation of fluid operated drill sharpeners, to increase their efciency and to reduce the size and weight of the machine.

`With these and other objects in view my invention consists in the features of construction and operation set forth in the following specifica-tion.

In the drawings annexed hereto and forming a part hereof,

Figure 1 is a frontelevation of the entire machine, some of the parts being shown in section.

Fig. 2, a side elevation of the upper portion of the machine.

Fig. 3, a longitudinal view of a part of the machine shown in section; and

Fig. Ll, a section taken on the line M of F ig. 2.

Referring more particularly to the drawings, the drill sharpening machine comprises a standard l upon which is mounted a base member 1a, the standard and base member being provided with a cylinder of two diameters shown at 2, the smaller diameter of which extends within the standard and the larger is contained within the base member 1, in which operates a dierential piston 3 having parts fitting both diameters of the cylinder. Extending vertically upwardly from the piston 3 is a rod l passing through the upper portion of the base member 1iL of the machine and being provided with an offset arm or crosshead 5. On the upper face of the base member 1a is provided a stationary jaw member 6 which with a corresponding jaw member 7 formed in the oset arm or crosshead 5 form a vise opened and closed by the movements of the piston 3 and offset arm 5, said parts being operated by means of fluid pressure supplied through conduits 8 and controlled by a suitable valve 9 working in a valve chest 9L which in turn is manually cont-rolled by a lever or handle 10. The piston is held from turning and the jaw member prevented from getting out of alinement by means of a gui-de rod la fastened into the member 1a forming the top of the base 1 and sliding in and out of a hole provided in the crosshead 5.

At one side of the base member 1a is an extension 11 preferably made integrally with the base member 1a and upon which is mounted a cylinder 12 of a reciprocatory percussive tool or hammer 13 having a suitable forming dolly 1l in its forward end, the axis of the forming dolly and vise, when closed, being in alinement. The extension 11 is provided with a bearing surface 15 for the percussive tool or hammer 13 which for convenience of manufacture may be arcuate in form as shown clearly in Fig. 4 and made to closely fit a corresponding arcuate shaped surface on the lower surface of the percussive tool 13. At the forward end of the bearing surface 15 is a dovetailed portion 16 adapted to fit a corresponding portion 17 on the percussive tool or hammer 13 and at the extreme end of the extension 11 is a clamping member 18, which, by means of a stud 19, retains the percussive tool or hammer 13 in close relation with the extension 11. The arc or curve upon which the surface 15 is shaped may be of such a radius that its center of curvature will vcoincide with the axis of the forming dolly 14. This will allow the surface 1-5 to be machined in the same operation of machining the bearing surfaces for the jaw members of the vise and will permit a slight variation of adjustment of the hammer 13 on the arm 11 without throwing the forming dolly out of alinement with the axis of the jaw members of the vise.

In order to supply motive fluid to the percussive tool or hammer 13, a conduit 20 extends through the extension 11 which is in communication with the supply 8 and valve chest 9a and extends from said supply to the clamping surface 15 of the extension 11. Fluid being supplied through said conduit 2O may be controlled by means of the lever 10 operating an additional valve (not shown). The lower surface of the percussive tool or hammer 13 resting against the surface 15 is provided with a fluid orice 21. This fluid orifice 21 is in alinement with the extension of the conduit 20 extending to the surface 15 so that a fluid-tight conduitextends from the valve chest 9a to the valve operating the percussive tool 13. It will be seen from this construction that withthe percussive tool or hammer 13 clamped in position upon the extension 11 the parts will be in fluid vtight relation to each other and that motive fluid may be supplied to the percussive tool 13 from the supply pipe 8 and valve chest 9a.

. From the description it is thought that the operation of the machine will be understood. However, a short description of the operation will be given. With the parts in the position as shown in the figures, a drill rod to be sharpened is inserted between the jaw members 6 and 7 and fluid is admitted to the cylinder 2 by means of handle 10 to force the crosshead or offset member 5 downwardly thus closing the vise about the drill rod. By-a further movement of the lever fluid is admitted to the reciprooatory hammer or percussive tool 13 thus forcing the forming dolly ll to strike against the end of the drill rod with a great number of blows and with considerable force, thus shaping and sharpening the end of the drill rod. A reverse movement of the handle 10 first stops the reciprocation of the hammer 13 and when the handle is brought back to its initial position the vise is again opened.

It is to be understood that while the present showing and description disclose only one specific embodiment of the present invention, other forms and modifications are included Within the spirit and scope thereof, as expressed in the appended claims.

What I claim is:

1. In a drill sharpening machine, in oombination, a. base, a cylinder contained within said base, a fluid operated piston therein, a single rod mounted centrally of said cylinformed in said crosshead, said vise being opened and closed by movement of said piston.

2. In a drill sharpening machine, in oombination, a base, a cylinder contained within said base, a fluid operated piston therein, a. movable jaw member of a vise operated thereby, an arm projecting from said base, a

fiuid operated reciprocatory hammer mounted thereon, said hammer operating a forming dolly, a conduit supplying fluid to said hammer extending through said .arm and clampingv means holding said hannner against said arm in fluid tight relation.

3. In a drill sharpening machine, in combination, a base member, a fluid operated vise mounted thereon, said base having an arm extending therefrom, the upper surface of said arm being arcuate in cross section, a fiuid operated percussive tool mounted on said arm, the lower surface of said toolboing arcuate to correspond with the upper surface of said arm.

4. In a drill sharpening machine, in combination, a base member, a fluid operated vise mounted thereon, said base having an arm extending therefrom, the upper surface of said arm being arcuate in cross section and of a radius to correspond with its distance from the axis of the vise, a fluid operated percussive tool mounted on said arm, the lower surface of saidtool being arcuate to correspond with the upper surface of said arm. In testimony whereof I have hereunto set my hand.

JESSE DITSON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

